@startuml
sprite $mail [48x48/16] {
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!define MATERIAL_MAIL(_alias) ENTITY(rectangle,black,mail,_alias,MATERIAL MAIL)
!define MATERIAL_MAIL(_alias, _label) ENTITY(rectangle,black,mail,_label, _alias,MATERIAL MAIL)
!define MATERIAL_MAIL(_alias, _label, _shape) ENTITY(_shape,black,mail,_label, _alias,MATERIAL MAIL)
!define MATERIAL_MAIL(_alias, _label, _shape, _color) ENTITY(_shape,_color,mail,_label, _alias,MATERIAL MAIL)
skinparam folderBackgroundColor<<MATERIAL MAIL>> White
@enduml